Frank Mack vs. Jim Peterson — Career Comparison

Looking at the career totals, Frank Mack and Jim Peterson are fairly close on the surface numbers. Frank Mack posted stronger numbers in ERA (4.94 vs 5.27) and home runs allowed (0.38 per nine innings vs 0.74). Jim Peterson had the advantage in WHIP (1.665 vs 1.732). By the career numbers, Frank Mack had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.